Simulink tapped delay block with vector inputs

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Sean
Sean le 13 Mar 2025
Commenté : Sean le 12 Août 2025 à 14:06
All,
I have often needed a "shift-register" function in Simulink that can accept vector inputs. The tapped delay only supports scalar inputs. I typically build this function using the "Matlab Function" block.
How do other people solve this problem? Is there a built-in solution I am not aware of?
Maybe someone from MathWorks is reading these questions? It is a pretty big gap that there is no built-in way to build a shift register with vectors.
Thanks.

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Vanita
Vanita le 12 Août 2025 à 10:18
Hi Sean,
To build a shift register block with vector input in Simulink, the Delay Line block from the DSP System Toolbox is a good option. This block supports vector inputs and can implement a shift register by delaying the input signal by a set number of samples. You can refer to the following document for more details:
Hope this helps!
  1 commentaire
Sean
Sean le 12 Août 2025 à 14:06
I was unaware that the Delay Line block might work. I am not in a position to test it, but I appreciate the information. Thanks!

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praguna manvi
praguna manvi le 17 Mar 2025
Hi @Sean,
The "Tapped Delay" block natively accepts only scalar inputs. A workaround to pass vector inputs is to use a "Buffer" block, setting the "Overlap" property to one less than the buffer size. Here is a useful discussion thread on a similar use case:
For more information on the "Buffer" block, refer to the following link:
  1 commentaire
Sean
Sean le 17 Mar 2025
Thanks for the response.
There are two problems with using the buffer block:
  1. The sample rate changes. This isn't always what you want.
  2. This block is not compatible with some of the codegen tools (the HDL coder, for example).

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